After receiving complaints from consumers about cheating by the online shopping sites, the weights and measures team raided warehouses of these companies and seized products worth over Rs 84 lakh as the goods did not conform to Package Commodity Rules, 2011.

Officials said the department studied in detail the trading mode adopted by online trading companies and ordered a special team to inspect warehouses of Flipkart and Amazon.

A special team visited the premises of InstaKart in Bhiwandi, which is a service provider for Flipkart India and Amazon Sellers Services Pvt Ltd.

Amitabh Gupta, controller of LMO, said the violations included the MRP not being mentioned on goods, the weight not being what was written on the box, no declaration regarding name and address of the manufacturer/packer/importer, and price of the package, customer care number/e-mail address and manufacturing date not being mentioned.

Cases have been registered against Instakart, Flipkart and Amazon Sellers Services Pvt. Ltd and the organization is investigating the matter further. Action against the manufacturer/packer and importer of those products will be taken as per provisions of the Legal Metrology Act, 2009, and Legal Metrology (Packaged Commodities) Rules, 2011, said Gupta.

"Instakart officials said they were supplying the product as per orders given by Flipkart. They also told the legal metrology officials that all products stored on Instakart's premises belong to Flipkart India Ltd. They showed the bill addressed by Flipkart India. Officials of Amazon said the premises were owned by them," said Gupta.

An Amazon India spokesperson said, "Officials from the state metrology department visited our fulfilment centre in Mumbai earlier this week to review products in the building for certain sellers. We are working closely with them and extending necessary support."